John jerome eymal



(No Model.)

J. J. RYMAL.

GEARING.

No. 300,001. Patented June 24, 1084.

. JOHN JEROME RYMAL, ()F MILXVAUKEE, WISCONSIN.

GEARING.

SPECIFICATION forming part of Letters Patent No. 300,801, dated June 24,1884.

(No model.)

To all whom it may concern.-

Be it known that 1, JOHN JEROME RYMAL, of Milwaukee, in the county ofMilwaukee and State of \Visconsin, have invented certain Improvements inGearing, of which the following is a specification.

The aim of this invention is to provide toothed gearing which will runwith less noise and wear and for a greater length of time than thatconstructed on the ordinary plan.

To this end it consists, essentially, in the combination, with metallicsupporting plates or disks, of intermediate layers or sheets of yieldingmaterial, preferably leather, the outer edges of which are out to formgear-teeth and adapted to receive the wear and strain, the constructionbeing such that the metallic portions do not form any part of thewearingsuri'ace. Under my improved construction the metallicplates,which are united by bolts,

. rivets, or other transverse connections, serve to support, carry, andcompress the leather, which serves as a wearingsurface or gear proper,and which, being thus sustained, will run for a great length of time andunder heavy strains without appreciable wear or change of form, andwithout producing the objectionable rumbling or chattering sound whichcommonly results from the use of other gearing.

The details of the gear constructed on my plan may be modified invarious respects without departing from the limits of my invention orchanging the mode of action; but it is preferred to retain substantiallythe construction and arrangement of parts represented in the drawings.In wheels having narrow faces it is sufiicicnt to use two supportingdisks or platesone on each side; but in wheels of greater width it maybe necessary to use two or more intermediate plates. \Vheels withincertain limits of diameter may have the disks or layers of leather eachin a single complete piece; but in wheels of large size it will benecessary to construct them of sections or segments of leather placededge to edge.

Referring to the accompanying drawings,, Figure 1 represents anelevation of my wheel, viewed edgewise, one-half of the same beingrepresented in section on the line 00 a: of Fig. 2. Fig. '2 represents aside View of the same, a portion of the side plate being broken away onthe line yy of Fig. 1. Fig. 3 is an edge View, illustrating theconstruction which is adapted for wheels having wide faces withintermediate supportingplates. Fig. 4is a side view of the wheel in aslightly-modified form, the supporting-plates being toothed or notchedat the outer edge instead of being continuous, as in the preceding form.

Referring to the drawings, A represents two outside plates or disks,provided with openings to receive the shaft, arbor, or other support.The central openings are preferably encircled by flanges formed on theplates, as shown in the drawings, to give a wide bearing on the shaftand admit of the plates being keyed or otherwise firmly secured thereon.The plates are of a diameter the same or substantially the same as thatof the wheel meas ured to the extremities of its teeth.

B represents the body portion of the wheel or wheel proper, consisting,as shown, of a number of layers or sheets of leather or equiva lentelastic material, placed one upon another side by side and insertedbetween the metallic plates or sheets or laminze, extending, as shown,in planes at right angles to the axis of the wheel. The leather portionhas its periphery out or otherwise fashioned into spurteeth of therequired form. The two plates are united, as shown, by transverse beltsor rivets b and 0, inserted through the same and also through theintermediate body of leather. These bolts or rivets are applied in suchmanner as to subject the leather to more compression, in order to givethe wearing-surfaces the necessary hardness and stability.

In order to prevent the teeth from yielding under the strain to whichthey are subjected, certain of the rivets or bolts are passedtransversely through the teeth-that is to say, in the direction of theaxis of the wheel. The number-of rivets or bolts passed through eachtooth may be varied according to the shape and size of the layer, thecharacter of the work to be done, and the other controlling cir-'cumstances in each case. The co-operating gear or pinion must be made ofsuch width that its teeth may enter between the side plates of my gearin order to engage the leather teeth.

The wheel represented in Fig. 8 is identical with that represented inthe preceding figures, except that it has in addition to the exteriorplate the intermediate plates of corresponding form. Theseintermediateplates assist in giving support to the leather and in maintaining theteeth and pawls in proper position, so that they may not be forced outof place by the strains encountered in practice. The gear or pinion toco-operate with this wheel must be provided with circumferential groovesor notches to receive the intermediate supporting-plates of my gear, asindicated in the drawings.

Vhile it is preferred to employ in ordinary cases supporting plates ordisks which have a continuous or unbroken periphery extending to orbeyond the ends of the teeth, there are cases in which the disks may benotched or toothed to correspond with the teeth of the body portion, asrepresented in Fig. 4. Vhen the toothed disks are employed, their teethare made usually of a size slightly less than those of the body, inorder that the entire wear and strain may be thrown on the latter.

The wheels are constructed, as in Fig. 3, with intermediatesupporting-plates. These plates may be toothed, to avoid the necessityof grooving the companion gear or wheel.

The intermediate sheets forming the body of the wheel may be composed ofpaper or equivalent material possessing a moderate degree of elasticity;but it ispreferred to use leather, because of its ability to withstandwear better than any other material at pres ent known to me, andbecause, also, of the fact that the wearing-surfaces will receive a highpolish and run with a slight degree of friction.

In order to reduce the expense and weight, the body portion isordinarily constructed with a central opening of a size greater thanthose in the side plates; but this is not a necessary feature.

I am aware that gear-wheels have been constructed of alternate sheets ofleather and metal, riveted or otherwise secured firmly together, withgear-teeth out in the outer edges. The object in view was simply that oflessening the noise, and the structure was such that the metallicportions were employed equally with the leather to receive the wear andstrain.

It is to be noted as a distinguishing feature of my gearing that thewearing-surfaces are composed wholly of leather or equivalent material,and the metallic portions are employed simply to give support thereto.

Having thus described my invention, what I claim is 1. In a gear-wheel,the combination, with metallic supporting and confining plates, of anintermediate body of leather or equivalent material having teeth formedtherein and adapted to receive the entire wear and strain.

2. I11 a gear-wheel, the combination of an elastic toothed body portion,consisting of sheets of leather or equivalent material, externalmetallic plates with corresponding teeth of a size less than the others,and fastening devices connecting the plates and passing through theintermediate body.

8. In a gear-wheel, a laminated body of leather or equivalent materialhaving peripheral teeth formed thereon, and external metallic platesprovided with teeth of a size slightly less than the teeth of the bodyportion, whereby the metallic portions are relieved from wear but causedto support the elastic teeth.

4. In agear-wheel, the combination, with external plates with peripheralteeth, of an intermediate laminated body of elastic material, alsoprovided with teeth, and transverse bolts or fastening devices passingthrough the teeth of the body and of the external plates, as describedand shown.

5. A gear-wheel consistingof toothed side plates provided with centralopenings to receive the shaft or arbor, and an intermediate toothed bodyof elastic material having a central opening of greater diameter thanthose of the plates.

6. In a gear-wheel having a body portion composed of leather withspur-teeth formed thereon, metallic side plates, and transverse bolts orrivets passed through the said plates and through the teeth of the bodyportion.

JOHN JEROME RYMAL.

Wi tn esses:

G. S. DRURY, IIARRY SnIrLnY.

